diff --git a/src/core/api/registry.go b/src/core/api/registry.go
index ed8b7b8f9..9f8c0ecc5 100644
--- a/src/core/api/registry.go
+++ b/src/core/api/registry.go
@@ -12,13 +12,15 @@ import (
 	"github.com/goharbor/harbor/src/replication/ng"
 	"github.com/goharbor/harbor/src/replication/ng/adapter"
 	"github.com/goharbor/harbor/src/replication/ng/model"
+	"github.com/goharbor/harbor/src/replication/ng/policy"
 	"github.com/goharbor/harbor/src/replication/ng/registry"
 )
 
 // RegistryAPI handles requests to /api/registries/{}. It manages registries integrated to Harbor.
 type RegistryAPI struct {
 	BaseController
-	manager registry.Manager
+	manager   registry.Manager
+	policyCtl policy.Controller
 }
 
 // Prepare validates the user
@@ -35,6 +37,7 @@ func (t *RegistryAPI) Prepare() {
 	}
 
 	t.manager = ng.RegistryMgr
+	t.policyCtl = ng.PolicyCtl
 }
 
 // Get gets a registry by id.
@@ -193,21 +196,39 @@ func (t *RegistryAPI) Delete() {
 	}
 
 	if registry == nil {
-		t.HandleNotFound(fmt.Sprintf("registry %d not found", id))
+		t.HandleNotFound(fmt.Sprintf("Registry %d not found", id))
 		return
 	}
 
-	// TODO: filter the policies by registry ID
-	_, policies, err := ng.PolicyCtl.List()
+	// Check whether there are replication policies that use this registry as source registry.
+	total, _, err := t.policyCtl.List([]*model.PolicyQuery{
+		{
+			SrcRegistry: id,
+		},
+	}...)
 	if err != nil {
-		msg := fmt.Sprintf("Get policies related to registry %d error: %v", id, err)
+		t.HandleInternalServerError(fmt.Sprintf("List replication policies with source registry %d error: %v", id, err))
+		return
+	}
+	if total > 0 {
+		msg := fmt.Sprintf("Can't delete registry %d,  %d replication policies use it as source registry", id, total)
 		log.Error(msg)
-		t.HandleInternalServerError(msg)
+		t.HandleStatusPreconditionFailed(msg)
 		return
 	}
 
-	if len(policies) > 0 {
-		msg := fmt.Sprintf("Can't delete registry with replication policies, %d found", len(policies))
+	// Check whether there are replication policies that use this registry as destination registry.
+	total, _, err = t.policyCtl.List([]*model.PolicyQuery{
+		{
+			DestRegistry: id,
+		},
+	}...)
+	if err != nil {
+		t.HandleInternalServerError(fmt.Sprintf("List replication policies with destination registry %d error: %v", id, err))
+		return
+	}
+	if total > 0 {
+		msg := fmt.Sprintf("Can't delete registry %d,  %d replication policies use it as destination registry", id, total)
 		log.Error(msg)
 		t.HandleStatusPreconditionFailed(msg)
 		return
diff --git a/src/core/main.go b/src/core/main.go
index 1ea4a19a7..7b393cf15 100644
--- a/src/core/main.go
+++ b/src/core/main.go
@@ -38,6 +38,7 @@ import (
 	"github.com/goharbor/harbor/src/core/filter"
 	"github.com/goharbor/harbor/src/core/proxy"
 	"github.com/goharbor/harbor/src/core/service/token"
+	"github.com/goharbor/harbor/src/replication/ng"
 )
 
 const (
@@ -129,8 +130,9 @@ func main() {
 		}
 	}
 
-	closing := make(chan struct{})
-	go gracefulShutdown(closing)
+	if err := ng.Init(); err != nil {
+		log.Fatalf("failed to initialize replication: %v", err)
+	}
 
 	filter.Init()
 	beego.InsertFilter("/*", beego.BeforeRouter, filter.SecurityFilter)
diff --git a/src/replication/ng/dao/policy.go b/src/replication/ng/dao/policy.go
index 24cdb7386..bc1ef7e00 100644
--- a/src/replication/ng/dao/policy.go
+++ b/src/replication/ng/dao/policy.go
@@ -5,8 +5,10 @@ import (
 	"time"
 
 	"github.com/astaxie/beego/orm"
+
 	common_dao "github.com/goharbor/harbor/src/common/dao"
 	"github.com/goharbor/harbor/src/replication/ng/dao/models"
+	"github.com/goharbor/harbor/src/replication/ng/model"
 )
 
 // AddRepPolicy insert new policy to DB.
@@ -19,33 +21,53 @@ func AddRepPolicy(policy *models.RepPolicy) (int64, error) {
 	return o.Insert(policy)
 }
 
-func filteredRepPolicyQuerySeter(name, namespace string) orm.QuerySeter {
+// GetPolicies list polices with given query parameters.
+func GetPolicies(queries ...*model.PolicyQuery) (int64, []*models.RepPolicy, error) {
 	var qs = common_dao.GetOrmer().QueryTable(new(models.RepPolicy))
+	var policies []*models.RepPolicy
 
-	// TODO: just filter polices by name now, and need consider how to  filter namespace.
-	qs = qs.Filter("name__icontains", name)
+	if len(queries) == 0 {
+		total, err := qs.Count()
+		if err != nil {
+			return -1, nil, err
+		}
 
-	return qs
-}
+		_, err = qs.All(&policies)
+		if err != nil {
+			return total, nil, err
+		}
 
-// GetTotalOfRepPolicies returns the total count of replication policies
-func GetTotalOfRepPolicies(name, namespace string) (int64, error) {
-	var qs = filteredRepPolicyQuerySeter(name, namespace)
-	return qs.Count()
-}
-
-// GetPolicies filter policies and pagination.
-func GetPolicies(name, namespace string, page, pageSize int64) (policies []*models.RepPolicy, err error) {
-	var qs = filteredRepPolicyQuerySeter(name, namespace)
-
-	// Paginate
-	if page > 0 && pageSize > 0 {
-		qs = qs.Limit(pageSize, (page-1)*pageSize)
+		return total, policies, nil
 	}
 
-	_, err = qs.All(&policies)
+	query := queries[0]
+	if len(query.Name) != 0 {
+		qs = qs.Filter("Name__icontains", query.Name)
+	}
+	if len(query.Namespace) != 0 {
+		// TODO: Namespace filter not implemented yet
+	}
+	if query.SrcRegistry > 0 {
+		qs = qs.Filter("SrcRegistryID__exact", query.SrcRegistry)
+	}
+	if query.DestRegistry > 0 {
+		qs = qs.Filter("DestRegistryID__exact", query.DestRegistry)
+	}
 
-	return
+	total, err := qs.Count()
+	if err != nil {
+		return -1, nil, err
+	}
+
+	if query.Page > 0 && query.Size > 0 {
+		qs = qs.Limit(query.Size, (query.Page-1)*query.Size)
+	}
+	_, err = qs.All(&policies)
+	if err != nil {
+		return total, nil, err
+	}
+
+	return total, policies, nil
 }
 
 // GetRepPolicy return special policy by id.
diff --git a/src/replication/ng/dao/policy_test.go b/src/replication/ng/dao/policy_test.go
index 8fa9895fc..1d8639d41 100644
--- a/src/replication/ng/dao/policy_test.go
+++ b/src/replication/ng/dao/policy_test.go
@@ -3,9 +3,12 @@ package dao
 import (
 	"testing"
 
-	"github.com/goharbor/harbor/src/replication/ng/dao/models"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+
+	common_models "github.com/goharbor/harbor/src/common/models"
+	"github.com/goharbor/harbor/src/replication/ng/dao/models"
+	"github.com/goharbor/harbor/src/replication/ng/model"
 )
 
 var (
@@ -84,34 +87,6 @@ func TestAddRepPolicy(t *testing.T) {
 	}
 }
 
-func TestGetTotalOfRepPolicies(t *testing.T) {
-	type args struct {
-		name      string
-		namespace string
-	}
-	tests := []struct {
-		name    string
-		args    args
-		want    int64
-		wantErr bool
-	}{
-		{name: "GetTotalOfRepPolicies 1", args: args{name: "Test 1"}, want: 1},
-		{name: "GetTotalOfRepPolicies 2", args: args{name: "Test"}, want: 3},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			got, err := GetTotalOfRepPolicies(tt.args.name, tt.args.namespace)
-			if tt.wantErr {
-				require.NotNil(t, err, "wantErr: %s", err)
-				return
-			}
-
-			require.Nil(t, err)
-			assert.Equal(t, tt.want, got)
-		})
-	}
-}
-
 func TestGetPolicies(t *testing.T) {
 	type args struct {
 		name      string
@@ -131,7 +106,16 @@ func TestGetPolicies(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			gotPolicies, err := GetPolicies(tt.args.name, tt.args.namespace, tt.args.page, tt.args.pageSize)
+			_, gotPolicies, err := GetPolicies([]*model.PolicyQuery{
+				{
+					Name:      tt.args.name,
+					Namespace: tt.args.namespace,
+					Pagination: common_models.Pagination{
+						Page: tt.args.page,
+						Size: tt.args.pageSize,
+					},
+				},
+			}...)
 			if tt.wantErr {
 				require.NotNil(t, err, "wantErr: %s", err)
 				return
diff --git a/src/replication/ng/model/policy.go b/src/replication/ng/model/policy.go
index e04c66f80..8ba0b10b6 100644
--- a/src/replication/ng/model/policy.go
+++ b/src/replication/ng/model/policy.go
@@ -152,6 +152,8 @@ type PolicyQuery struct {
 	Name string
 	// TODO: need to consider how to support listing the policies
 	// of one namespace in both pull and push modes
-	Namespace string
+	Namespace    string
+	SrcRegistry  int64
+	DestRegistry int64
 	models.Pagination
 }
diff --git a/src/replication/ng/policy/manager/manager.go b/src/replication/ng/policy/manager/manager.go
index db6d4d9b3..7a65423df 100644
--- a/src/replication/ng/policy/manager/manager.go
+++ b/src/replication/ng/policy/manager/manager.go
@@ -156,25 +156,8 @@ func (m *DefaultManager) Create(policy *model.Policy) (int64, error) {
 
 // List returns all the policies
 func (m *DefaultManager) List(queries ...*model.PolicyQuery) (total int64, policies []*model.Policy, err error) {
-	// default query parameters
-	var name = ""
-	var namespace = ""
-	var page int64 = 1
-	var pageSize int64 = 15
-
-	if len(queries) > 0 {
-		name = queries[0].Name
-		namespace = queries[0].Namespace
-		page = queries[0].Pagination.Page
-		pageSize = queries[0].Pagination.Size
-	}
-
 	var persistPolicies []*persist_models.RepPolicy
-	persistPolicies, err = dao.GetPolicies(name, namespace, page, pageSize)
-	if err != nil {
-		return
-	}
-	total, err = dao.GetTotalOfRepPolicies(name, namespace)
+	total, persistPolicies, err = dao.GetPolicies(queries...)
 	if err != nil {
 		return
 	}